﻿/*
 * FCKeditor - The text editor for Internet - http://www.fckeditor.net
 * Copyright (C) 2003-2009 Frederico Caldeira Knabben
 *
 * == BEGIN LICENSE ==
 *
 * Licensed under the terms of any of the following licenses at your
 * choice:
 *
 *  - GNU General Public License Version 2 or later (the "GPL")
 *    http://www.gnu.org/licenses/gpl.html
 *
 *  - GNU Lesser General Public License Version 2.1 or later (the "LGPL")
 *    http://www.gnu.org/licenses/lgpl.html
 *
 *  - Mozilla Public License Version 1.1 or later (the "MPL")
 *    http://www.mozilla.org/MPL/MPL-1.1.html
 *
 * == END LICENSE ==
 *
 * FCKJustifyCommand Class: controls block justification.
 */

var FCKJustifyCommand = function( alignValue )
{
    this.AlignValue = alignValue ;

    // Detect whether this is the instance for the default alignment.
    var contentDir = FCKConfig.ContentLangDirection.toLowerCase() ;
    this.IsDefaultAlign = ( alignValue == 'left' && contentDir == 'ltr' ) ||
                          ( alignValue == 'right' && contentDir == 'rtl' ) ;

    // Get the class name to be used by this instance.
    var cssClassName = this._CssClassName = ( function()
    {
        var classes = FCKConfig.JustifyClasses ;
        if ( classes )
        {
            switch ( alignValue )
            {
                case 'left' :
                    return classes[0] || null ;
                case 'center' :
                    return classes[1] || null ;
                case 'right' :
                    return classes[2] || null ;
                case 'justify' :
                    return classes[3] || null ;
            }
        }
        return null ;
    } )() ;

    if ( cssClassName && cssClassName.length > 0 )
        this._CssClassRegex = new RegExp( '(?:^|\\s+)' + cssClassName + '(?=$|\\s)' ) ;
}

FCKJustifyCommand._GetClassNameRegex = function()
{
    var regex = FCKJustifyCommand._ClassRegex ;
    if ( regex != undefined )
        return regex ;

    var names = [] ;

    var classes = FCKConfig.JustifyClasses ;
    if ( classes )
    {
        for ( var i = 0 ; i < 4 ; i++ )
        {
            var className = classes[i] ;
            if ( className && className.length > 0 )
                names.push( className ) ;
        }
    }

    if ( names.length > 0 )
        regex = new RegExp( '(?:^|\\s+)(?:' + names.join( '|' ) + ')(?=$|\\s)' ) ;
    else
        regex = null ;

    return FCKJustifyCommand._ClassRegex = regex ;
}

FCKJustifyCommand.prototype =
{
    Execute : function()
    {
        // Save an undo snapshot before doing anything.
        FCKUndo.SaveUndoStep() ;

        var range = new FCKDomRange( FCK.EditorWindow ) ;
        range.MoveToSelection() ;

        var currentState = this.GetState() ;
        if ( currentState == FCK_TRISTATE_DISABLED )
            return ;

        // Store a bookmark of the selection since the paragraph iterator might
        // change the DOM tree and break selections.
        var bookmark = range.CreateBookmark() ;

        var cssClassName = this._CssClassName ;

        // Apply alignment setting for each paragraph.
        var iterator = new FCKDomRangeIterator( range ) ;
        var block ;
        while ( ( block = iterator.GetNextParagraph() ) )
        {
            block.removeAttribute( 'align' ) ;

            if ( cssClassName )
            {
                // Remove the any of the alignment classes from the className.
                var className = block.className.replace( FCKJustifyCommand._GetClassNameRegex(), '' ) ;

                // Append the desired class name.
                if ( currentState == FCK_TRISTATE_OFF )
                {
                    if ( className.length > 0 )
                        className += ' ' ;
                    block.className = className + cssClassName ;
                }
                else if ( className.length == 0 )
                    FCKDomTools.RemoveAttribute( block, 'class' ) ;
            }
            else
            {
                var style = block.style ;
                if ( currentState == FCK_TRISTATE_OFF )
                    style.textAlign = this.AlignValue ;
                else
                {
                    style.textAlign = '' ;
                    if ( style.cssText.length == 0 )
                        block.removeAttribute( 'style' ) ;
                }
            }
        }

        // Restore previous selection.
        range.MoveToBookmark( bookmark ) ;
        range.Select() ;

        FCK.Focus() ;
        FCK.Events.FireEvent( 'OnSelectionChange' ) ;
    },

    GetState : function()
    {
        // Disabled if not WYSIWYG.
        if ( FCK.EditMode != FCK_EDITMODE_WYSIWYG || ! FCK.EditorWindow )
            return FCK_TRISTATE_DISABLED ;

        // Retrieve the first selected block.
        var path = new FCKElementPath( FCKSelection.GetBoundaryParentElement( true ) ) ;
        var firstBlock = path.Block || path.BlockLimit ;

        if ( !firstBlock || firstBlock.nodeName.toLowerCase() == 'body' )
            return FCK_TRISTATE_OFF ;

        // Check if the desired style is already applied to the block.
        var currentAlign ;
        if ( FCKBrowserInfo.IsIE )
            currentAlign = firstBlock.currentStyle.textAlign ;
        else
            currentAlign = FCK.EditorWindow.getComputedStyle( firstBlock, '' ).getPropertyValue( 'text-align' );
        currentAlign = currentAlign.replace( /(-moz-|-webkit-|start|auto)/i, '' );
        if ( ( !currentAlign && this.IsDefaultAlign ) || currentAlign == this.AlignValue )
            return FCK_TRISTATE_ON ;
        return FCK_TRISTATE_OFF ;
    }
} ;
